Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e191b6d0673b3c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 09:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02f2e51448611aa8bffb50ceeca0aff7 SHA-1: e7935198e24c2770bfffcc5992af9e4e8b39ea11 SHA-256: f6e191b6d0673b3c3bbedd99e31ad0eaf4248169ad149bdb7a14777fd4d924de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of these links and the overall structure strongly indicate a malicious intent to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sea-cruise.ru/ckfinder/userfiles/files/63805535452.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b9dac1140c0cc64216120af43315a825/sudene.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd9b4428c---gagojadekar.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084889c3f428---20259200445.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9709b4eca---47228795201.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a33d9f7177031483d20f2a6b0ffbbf74/86808625109.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dto4iq09u2pcu9u8bvk76qmv73/4867205014.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nagowevasagu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e7c836e3e7e1d6ccb125daee3ea00bd6/zagasabenoxepalubo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/45aa902ef6a05739b5de3af74b568a61/43029647109.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wunifazuxekazisegifitasog.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4nv1o28nblt27647lji5nn6597/zatomolipo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/redukev.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/51338733220.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889ffdc05fb---fubenibupekikujoterofi.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/46848873743.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10a5d2bb3---6278944189.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/44020373183.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ca0cf8cefc0906b01d11a6ae7c0316f/95963002917.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/33863958159.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/vodobafemiv.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c53053fa4cca3564fc65c69db6992322/14646217966.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecaa130e52---rozupowovimuridize.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5f052293---nufebemajebeputotu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/tomuwof.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/464d780010aa3a8fa8fbfeba4f3326c3/12290043540.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf0124da06---2858469022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=3rd+conditional+sentencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 17656 bytes
SHA-256: ed96803c4d364f12bcca409440b2cf3a1ff12f9327fda45b89b9c431044ee874
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 10440 bytes
SHA-256: 097d5f252bb4d4c4d0c5938597e994a39f259ae6fd376f932e9eab9df5dd92e3